Comparison of graphene nanoribbons with Cu and Al interconnects

We present a comparative study of graphene nanoribbon (GNR) interconnects (ICs) with sub-50 nm copper (Cu) and aluminum (Al) ICs. We extend existing models for all materials in order to understand the physical size effects that occur when the electron mean free path (λMFP) becomes comparable to the IC dimensions. We calibrate such models against the best publicly available data. We find that, depending on geometrical configuration, either Al or GNRs could hold advantages over Cu at linewidths <10 nm.